Window lock



T. LARSEN Feb. 2, 1967 WINDOW LOCK Filed Nov. 23, 1964 I NVEN TOR.

7QYG 1/5 4255A/ `v TTORNEYS United States Patent Oiiiice 3,306,644Patented Feb. 28, 1967 The present invention relates to improvements inlocks for double hung window sash. The present invention provides awindow lock which compensates for slight vertical and transversedisplacement between the two sash members, and thereby provides a securelock regardless of such displacement.

In accordance with the present invention, I provide a cammin-g type lockmember including a camming latc-h having a hook shaped leading endportion, and being pivotally secured to one of the rails cooperating ltodene the window meeting rail. The camming latch has a hook shapedleading end portion which is progressively tapered so that it has itssmallest cross sectional area at its extremity. The camming latchcooperates with a keeper member secured to the other of the rails of thewindow sash, the keeper having a channel therein with an arcuatelyshaped inlet end and a progressively decreasing thickness. Thus, whenthe camming latch is pivoted, the hook shaped end is freely receivedwithin the arcuately shaped inlet end, and the resulting carnming actionresulting from further pivotal movement of the camming latch within thechannel acts to draw the camming latch and the keeper into lockedengagement with each other. This type of engagement the-rebycornpensates for slight vertical or lateral `displacement between therails and the two window sash members and assures a tig-ht lock underthese circumstances.

An object of the present invention is to provide an improved window lockassembly for double Ihung window sash, which, compensates for somevertical and lateral displacement between the locking members.

Still another object of the invention is to provide a positively actingwindow lock which can be economically manufactured.

Other objects and features of the present invention will -be apparent tothose skilled in the art from the -following description of the attacheds'heet of drawings which illustrates a preferred embodiment of theinvention.

In the drawings:

FIGURE 1 is a view in elevation of a typical double hung window sash towhich the lock of the present invention can be applied;

FIGURE 2 is a plan View, partially broken away to illustrate theconstruction of the lock assembly, and showing the lock assembly in bothits engaged and disengaged position;

FIGURE 3 is a cross-sectional View taken substantially along t-he lineIII-III of FIGURE 2; and

FIGURE 4 is a side elevational View of the keeper assembly of theinvention, taken alon-g the line IV-IV of FIGUR-E 3. y

As shown in the drawings:

In FIGURE 1, reference numeral indicates generally a conventional typeof double hung window sash including an upper sash member 11 and a lowersash member 12 carrying panes of glass 13 and 14 respectively. The lowerrail of the upper sash member 11, identified at reference numeral 16 isVarranged to cooperate with the upper rail member of the lower sashmember 12, identified at reference numeral 17 to provide the meetingrail for the double hung window.

A mounting plate 18 is secured to the rail i7 as by means of screws 19.Mounted on the plate 18 is a pivot engage in camming relation.

pin 21 which provides the pivotal axis for a camming latch generallyindicated at reference numeral 22 in the drawings. The latch 22 has astraight trailing end portion 23 and a hook shaped leading end portion24. As best seen in FIGURE 3, the leading end portion 24 isdiminishingly tapered at its rforward extremity.

The camming latch 23 is arranged to cooperate with a keeper generallyindicated at reference numeral 26 in the drawings and secured to therail 16 yby means of a mounting plate 27 and screws 28. The keeper 26includes an overhangng bar member 29 which cooperates with the mountingplate 27 to define a channel 31, as best seen in FIGURE 4. It should benoted that the width of the channel progressively decreases from rightto left as viewed in FIGURE 4, and that an aperture 32 is providedintermediate the ends of the channel 31. From FIGURE 2 it will beobserved that the inlet end of the channel has an arcuate cammingsurface 33 against which the inner periphery of the hook shaped leadingend portion 24 of the latch 22 is arranged to Thus, pivotal movement ofthe latch `22 about the pivot pin 21 causes the hook type end portion 24to bear against the camming surface 33, and pull the keeper 26 intosecure locked engagement with the latch 22. At the same time, theextreme end portion 34 of the latch 22 is arranged to be received inseated relation within the aperture 32.

At the inlet end of the keeper 26, the space between the bar 29 and theupper surface of the mounting plate 27 is significantly greater than thethickness of the extremity 34 of the latch. Thus, upon initialengagement of the latch 22 with the socket 26, some variations in thevertical positions of the rails 16 and 17 can be tolerated, since oncethe camming action begins, the latch 22 serves to draw in the keeperinto secure locked engagement. Similarly, if there is some lateraldisplacement of the latch 22 with respect to the keeper 26, theinitiation of the camming action corrects this disparity, and achieves asecure locking action between the two parts.

From the foregoing, it will 4be understood that the window lock of thepresent invention provides an economical, .but highly effective Windowlockin-g structure for doulble hung window sash, making it possible tosecure complete locking action even when there is some misalignmentbetween the sash members.

It should also be understood that various modifications can be made tothe described embodiment without departing from the scope of the presentinvention.

I claim as my invention:

A latching means for securing double hung window sash to their meetingrails comprising a substantially at latch element formed with anelongated handle portion which curves at one end to form an elongatedarcuate camming edge portion, and a laterally extending portion-adjacent said camming edge portion provided with pivot meanstherethrough and mountable on one such sash; and a keeper mountable onthe other sash and formed with a pair of superposed substantially datportions spaced toreceive said camming edge portion and joined alongadjacent edges by a web; said web forming at one end a curved innersurface engageable in a camming relationship w-ith said camming edgeportion, and at the other end with a separate, spaced web portionhavin-g an edge surface forming a stop for the end of said camming edgeportion, a surface of said camming edge portion and an adjacent surfaceof one of said superposed portions of said keeper being matirrglyinclined to provide, with the aforementioned camming, a tighten- 3 4 ingof said sash in two directions during engagement of 2,647,789 8/1953Chayne 292-96 said latch element and keeper. 3,160,433 12/ 1964 Chiegeret a1. 292-241 References Cited by the Examiner FOREIGN PATENTS UNITEDSTATES PATENTS 5 28,6126 1902 Great Britain. 21,328 8/1858 Falconer292-101 10244 1913 Great Bntam 2311,401 8/1880 Cleaveland 292-108584,343 6/1897 Fmelich 292 103 EDWARD C. ALLEN, Przmaly Examzner.

2,531,256 11/1950 Clasen 292-241 X RICHARD E. MOORE, Examiner.

